The PGS-12/24/40.5 pole-mounted load switch is suitable for rated voltages of 12kV, 24kV, and 40.5kV, with rated current of 400A and 630A. It is designed for breaking and closing load current, overload current in power systems operating at 50/60Hz, automatically isolating faulty sections of distribution lines. The switch can be equipped with an intelligent microcomputer controller, allowing manual operation, electric operation, and remote monitoring and control.
The internal body uses high-purity (99.9%) SF6 gas with excellent insulation and arc-extinguishing performance. It has an extremely short arc-extinguishing time (1/2 cycle wave) and good insulation recovery characteristics. The load current interruption has a short arc-extinguishing time, resulting in minimal contact consumption during interruption, eliminating the need for maintenance and replacement of interrupting parts. The switch adopts a spring-stored energy operating mechanism with the main circuit’s operating mechanism capable of completing disconnection or closing within 0.06 seconds, coordinating well with backup protection devices.
Maintains insulation performance and arc-extinguishing capability even at zero gauge pressure if SF6 gas leakage reduces the internal gas pressure to zero gauge pressure. Inlet and outlet line bushings use ceramic cable or terminal type for flexible selection.
Features high-pressure explosion-proof pressure relief device to prevent the switch’s casing from bursting due to a sudden increase in internal pressure during abnormal conditions. Equipped with low-pressure interlock alarm device and manual interlock device.Built-in with three current transformers, a zero-sequence current transformer group, and six voltage sensors to collect distribution network operating parameters. Current transformer turns ratio of 600:1A or 1000:1A, with 0.5-level accuracy. Includes overcurrent
protection to prevent overcurrent in the current measurement device. Voltage sensors on the power side (A, B, C) and load side (R, S, T), with a turns ratio of 5800V/0.4V, maintaining stable accuracy at 1.0%.
Ambient condition
Altitude: ≤2000m;
Wind Pressure: 700Pa;
Ice Thickness: 10mm;
Ambient Air Temperature: -40°C to +55°C;
Creepage Distance: 38mm/kV;
Installation site: no fire, explosion hazard, serious dirt, chemical corrosion, and severe vibration.
